If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes.
This calculator uses centiStokes (cSt), which are equivalent to mm^2/s. Higher quality oils tend to have higher viscosity indices, and while there are ranges in every category, a synthetic oil will tend to have a much higher viscosity index than its conventional counterpart. viscous fluids that contain an elastic portion. If you know the viscosity of your oil at 40✬ and 100✬ (100✯ and 212✯) you can easily calculate its Viscosity Index. The specific field of viscometry covers ideally viscous fluids, and considering certain restrictions also viscoelastic liquids, i.e. Calculator for viscosity index (VI) according to ASTM D2270 and ISO 2909. If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes. Standard practice for calculating viscosity index from kinematic viscosity at 40 and 100☌. Oil needs to flow when cold, but not get too thin and runny when it's warm. Viscosity Index Calculator This calculator uses centiStokes (cSt), which are equivalent to mm2/s. That is, oil with a high VI will retain their viscosity over a wider temperature range and work as designed in both hot and cold environments.Ī higher VI is important when your machine will experience a big change in operating temperatures.
The higher the viscosity index, the lower the change in viscosity. The degree to which the viscosity decreases determines the Viscosity Index (VI). The viscosity index is an important value, especially for lubricants. The viscosity of an oil decreases as temperature increases. The dynamic viscosity is the essential value for evaluating the lubricating behavior. Viscosity Index and what you need to know
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